Radio link parameter updating method in mobile communication system

ABSTRACT

A radio link (RL) parameter updating method of a high speed downlink packet access (HSDPA) system in a mobile communication system is disclosed. According to a radio channel situation of a terminal, an RL parameter applied to transmission and reception of control information between the terminal and a base station is dynamically controlled. For this purpose, the RL parameter updating method includes: a step in which the base station determines whether to update an HSDPA related parameter and transmits the parameter update information to the RNC to trigger updating of the RL parameter; and a step in which the RNC updates the HSDPA related parameter and transmits it to the terminal. The parameter update information is delivered through an RL parameter update response message, and the RNC is a serving RNC. Accordingly, because the base station is able to control the HSDPA related parameter, the HSDPA scheduling at the base station is guaranteed, so that a radio resource can be effectively used depending on the radio channel situation.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a 3GPP universal mobiletelecommunications system (UMTS) and, more particularly, to a method forupdating a radio link parameter in a system providing a high speeddownlink packet access (HSDPA) service.

[0003] 2. Description of the Background Art

[0004] In order to support a high speed packet data service in downlink,in third generation partnership project (3GPP) UMTS system, there is atransport channel called a high speed downlink shared channel (HS-DSCH).The HS-DSCH is used in a system supporting a high speed downlink packetaccess (HSDPA). The HS-DSCH uses a short transmission time interval(TTI) (3 slot, 2 ms) and supports various modulation code sets (MCS) tosupport a high data rate. That is, the UMTS system can attain optimumdata transmission performance by selecting MCS based on channelcondition and using Hybrid ARQ that combines automatic repeat request(ARQ) and coding techniques.

[0005] The HS-DSCH transmits a high speed user data at every sub-frameof 2 ms. The transport channel, HS-DSCH, is mapped onto a physicalchannel called a high speed physical downlink shared channel (HS-PDSCH).

[0006] For transmission of user data through the HS-DSCH, controlinformation should be transmitted. The control information istransmitted through the downlink (DL) shared control channel (HS-SCCH)and the uplink (UL) dedicated physical control channel (HS-DPCCH).

[0007] The downlink shared control channel (HS-SCCH) is a type of adownlink (DL) common control channel to support the HSDPA technique. TheDL HS-SCCH is a downlink physical channel with spreading factor of 128and data rate of 60 kbps. The HS-SCCH is used to transmit a UE ID(identification) and control information so that the UE can receiveHS-DSCH transmitting a high speed user data after receiving HS-SCCH.

[0008]FIG. 1 illustrates a frame structure of the uplink HS-DPCCH.

[0009] With reference to FIG. 1, the uplink HS-DPCCH is constructed witha radio frame with a period (T_(f)) of 10 ms and each radio frameconsists of five subframes of 2 ms. One sub-frame consists of threeslots.

[0010] The uplink HS-DPCCH transmits an uplink feedback signalingrelated to transmission of a downlink HS-DSCH data. The uplink feedbacksignaling generally includes ACK (acknowledgement)/NACK (negativeacknowledgement) information for the HARQ and a channel qualityindicator (CQI). The ACK/NACK information is transmitted at the firstslot of the HS-DPCCH sub-frame and the CQI is transmitted at the secondand third slots of the HS-DPCCH sub-frame. The HS-DPCCH is alwaysconfigured with the UL DPCCH. The ACK/NACK informs ACK or NACKinformation for a user data packet transmitted through the DL HS-DSCHaccording to the HARQ mechanism, and the CQI transmits statusinformation of the downlink radio channel obtained from the measurementof the DL CPICH (Common Pilot Channel) in the UE, to a base station.

[0011]FIG. 2 illustrates a structure of a UMTS radio access network(UTRAN).

[0012] With reference to FIG. 1, the UTRAN includes a serving RNC (SRNC)and a drift RNC (DRNC) that control a base station (a node B). In a softhandover, the terminal (UE) maintains radio links with base stationsconnected to the SRNC and the DRNC. In this case, the base station (nodeB) and RNC (the SRNC and the DRNC) are connected over the lub interface,and the SRNC and the DRNC are connected over the lur interface. Aninterface between the SRNC and a core network (CN) is referred to the luinterface.

[0013] In general, the radio network controller (RNC) directly managesthe node B and is classified into a controlling RNC (CRNC) (not shown)managing a common radio resource and a serving RNC (SRNC) managing adedicated radio resource assigned to respective UEs 122.

[0014] The DRNC exists in a drift radio network subsystem (DRNS) and, ifthe UE moves from a region covered by the SRNC to a region covered bythe DRNC, the DRNC provides its own radio resource to the UE.

[0015] In the UTRAN, a radio access interface protocol is divided into acontrol plane and a user plane. The user plane is a domain where usertraffic such as voice or an IP packet is transmitted. The control planeis a domain where control information is transmitted.

[0016]FIG. 3 illustrates a control plane protocol in the UTRAN.

[0017] With reference to FIG. 2, the control plane protocol includes aradio resource control (RRC) protocol used between the UE and the RNC, anode B application part (NBAP) protocol used between the base station(node B) and the RNC, and a radio network subsystem application part(RNSAP) protocol used between the RNC and the core network (CN). TheNBAP, RNSAP and RANAP protocols can contain various control messagesbetween the base station and RAN, between the RNCs and between the corenetwork and the RNC. In case that the control message is transmitted inthe user plane, it is transmitted as a type of control frame of frameprotocol, while in case that the control message is transmitted in thecontrol plane, it is transmitted as a type of NBAP or RNSAP message.

[0018]FIG. 4 shows an example procedure for configuration of the HS-DSCHchannel when the dedicated channel (DCH) is configured in the UE.

[0019] First of all, a radio link (RL) for the HS-DSCH is reconfigured.For this purpose, the SRNC sends an RL reconfiguration prepare messageto the DRNC to initiate the RL reconfiguration procedure (step S102).

[0020] The DRNC sends the RL reconfiguration prepare message to eachnode B to request each node B to prepare a synchronized RLreconfiguration procedure (step S104). Then, the corresponding node Bconfigures a radio resource for the HS-DSCH and sends an RLreconfiguration ready message as a response to the RL reconfigurationprepare message (step S106).

[0021] After the DRNC completes the preparation of RL reconfiguration,it sends an RL reconfiguration ready message to the SRNC (step S108).The SRNC sends an RL reconfiguration commit message to the DRNC (stepS110), and the DRNC sends the RL reconfiguration commit message to thenode B (step S112).

[0022] Through these steps, a radio link and a transport bearer forHS-DSCH are configured. That is, an ALCAP lub transport bearer is setbetween the node B and the DRNC, and an ALCAP lur transport bearer isset between the DRNC and the SRNC.

[0023] After the setup of the radio link is completed, the SRNC sends aradio bearer reconfiguration message to the UE to set up an HS-DSCH(step S114), and the UE responds thereto with a radio bearerreconfiguration complete message (step S116). Such messages are sent asan RRC (radio resource control) message.

[0024] With those steps completed, an HS-DSCH transport channel is setup and an MAC-hs sub-layer is constructed in the node B to manageHS-DSCH transmission.

[0025] Thereafter, when there is a downlink data to be transmitted, theSRNC sends an HS-DSCH capacity request control frame to the DRNC (stepS118) and the DRNC forwards the corresponding message to the node B(step S120). Then, the node B determines the amount of data that can besent for the HS-DSCH and reports the determined information to the DRNCthrough a HS-DSCH capacity allocation control frame of a frame protocol(step S122), and the DRNC sends the HS-DSCH capacity allocation controlframe to the SRNC (step S124).

[0026] Afterwards, the SRNC starts to send downlink data to the node B(step S126) and the node B initiates transmission of the downlink datathrough the HS-DSCH. That is, the node B transmits signaling informationrelated to the HS-PDSCH to the UE through the shared control channel(HS-SCCH) (step S128) and transmits the HS-DSCH data to the UE throughthe HS-PDSCH (step S130).

[0027] With reference to FIG. 6, if the DCH is not configured, the radiolink setup procedure is used in place of the radio link (RL)reconfiguration procedure.

[0028] A detailed physical layer procedure that the UE transmits afeedback signal (ACK or NACK) through the HS-DPCCH after receiving theHS-DSCH data is as follows:

[0029] The UE monitors a UE ID transmitted through HS-SCCH to recognizewhether there is data it is to receive. Then, if there is data it is toreceive, the UE receives the control information transmitted through theHS-SCCH and the HS-DSCH data transmitted through the HS-PDSCH using thereceived control information. The UE decodes the received HS-PDSCH data,checks a CRC, and transmits ACK or NACK to a base station according tothe CRC check result.

[0030] At this time, the UE can repeatedly transmits ACK/NACK duringmultiple consecutive HS-DPCCH sub-frames. The number of the consecutiveHS-DPCCH sub-frames for ACK/NACK repetition is equal to a repetitionfactor of ACK/NACK, N_acknack_transmit. If, however, the UE fails toacquire control information corresponding to itself from the monitoredHS-SCCH, it does not transmit ACK/NACK to the base station.

[0031] In addition, the UE measures a common pilot channel (CPICH) andtransmits a channel quality indicator (CQI) value the UE repeatedlytransmits CQI during multiple consecutive HS-DPCCH sub-frames. Thenumber of the consecutive HS-DPCCH sub-frames for CQI repetition isequal to a repetition factor of CQI, N_cqi_transmit.

[0032] As afore-mentioned, in the conventional HSDPA system, the radiolink parameter updating process is initiated only by the RNC. That is,the RNC detects/determines whether update of a parameter for a radiolink is necessary, and if the parameter needs to be updated, the RNCsends an updated radio parameter value to the node B. In other words,the node B can not update the HS-DPCCH parameters by its own decisionbut can merely update the HS-DPCCH parameters only through the radiobearer reconfiguration procedure the RNC triggers.

[0033] However, in the HSDPA system, a HSDPA scheduler exists in thenode B, so that it should be possible that a HSDPA scheduler updates theHS-DPCCH parameters by its own decision even without an initiation ofthe RNC if the update is necessary.

[0034] In the case that the RNC starts updating the HS-DPCCH relatedparameter (i.e., ACK/NACK, and the period and repetition information ofCQI, etc.), the HSDPA scheduler of the node B can not control on its ownthe ACK/NACK transmission and the CQI reporting according to channelcondition for the UE (terminal). Thus, the conventional parameterupdating method is disadvantageous in that the HSDPA scheduling islimited and the radio resource is inefficiently used.

[0035] The above references are incorporated by reference herein whereappropriate for appropriate teachings of additional or alternativedetails, features and/or technical background.

SUMMARY OF THE INVENTION

[0036] Therefore, an object of the present invention is to provide aradio link parameter updating method that is capable of effectivelyoperating HSDPA scheduling function and radio resource management.

[0037] Another object of the present invention is to provide a parameterupdating method in which a radio link parameter can be updated in a basestation.

[0038] Still another object of the present invention is to provide aparameter updating method in which a base station can initiate updatinga radio link parameter without RNC's initiation.

[0039] Yet another object of the present invention is to provide asignaling for sending a to-be-updated parameter value from a basestation to an RNC.

[0040] Another object of the present invention is to provide a radiolink parameter updating method initiated by a base station reflecting aradio link situation.

[0041] Another object of the present invention is to provide a basicprocedure for supporting a method of signaling parameter updated in abase station to an RNC.

[0042] Another object of the present invention is to provide a basicprocedure by which an RNC provides information used for updating aparameter to a base station.

[0043] Another object of the present invention is to provide a basicprocedure by which a radio network controller informs a base station ofa radio link situation of a terminal.

[0044] To achieve at least the above objects in whole or in parts, thereis provided a radio link parameter updating method for a high speeddownlink packet access (HSDPA) system in a mobile communication system,in which a base station triggers updating of a radio link parameter toan RNC to dynamically change a parameter of a radio link depending on aradio channel situation.

[0045] Preferably, the parameter is an uplink parameter between aterminal and a base station which is a HSDPA related parameter. In thiscase, the HSDPA related parameter can be a high speed dedicated physicalcontrol channel (HS-DPCCH) related parameter, a high speed downlinkshared channel (HS-DSCH) related parameter and a downlink shared controlchannel (HS-SCCH) related parameter. The base station triggers updatingthe parameter by sending parameter update information to the RNC.

[0046] Preferably, the parameter update information is a radio link (RL)parameter update request message. The RL parameter update requestmessage includes at least one of a channel quality indicator (CQI)feedback cycle value, an ACK/NACK repetition factor value, a CQIrepetition factor value, a CQI power offset, ACK power offset and/orNACK power offset value, and an HS-SCCH code change indicator value.

[0047] If a radio channel state (situation) of the terminal is changed,the base station can determine whether to update a RL parameter. Theparameter updating is performed at every reporting period or whenever aparameter indicating a state of the radio link situation exceeds acertain threshold value. The period and the threshold value areinternally set or are sent from the RNC through the RL parameter updateinitiation message.

[0048] Preferably, the base station can control the parameter updateinformation according to an RL configuration information of theterminal.

[0049] Preferably, the RL configuration information is sent from the RNCto the base station through an RL configuration; information message. Inthis case, the base station analyzes the RL configuration information ofthe current terminal, and triggers the parameter updating when theterminal enters or leaves a handover situation. In addition, the basestation analyzes the RL configuration information of the currentterminal and triggers the parameter updating when there is a change inthe number of radio links of the terminal.

[0050] Preferably, the RNC sends time information indicating when theupdated parameter is to be applied, to the base station. The RNC sendsthe updated parameter and the time information to the terminal throughthe radio resource control (RRC) signaling. In this case, the timeinformation is an activation time or a connection frame number (CFN)parameter, and the time information is the same as time information sentto the base station.

[0051] In the above method, the RNC is a serving RNC (SRNC).

[0052] To achieve at least these advantages in whole or in parts, thereis further provided a radio link parameter updating method for a highspeed downlink packet access (HSDPA) system in a mobile communicationsystem, in which, if there is a function difference between a schedulerof the base station and a scheduler of an RNC, the RNC finally performsupdating of a parameter of a radio link as the base station triggers theparameter updating.

[0053] Preferably, the RNC is a serving RNC (SRNC).

[0054] Preferably, the radio link parameter is a high speed dedicatedphysical control channel (HS-DPCCH) related parameter.

[0055] Preferably, the base station sends to-be-updated parameterinformation to the RNC to trigger the parameter updating in the RNC, andthe parameter information is a radio link (RL) parameter update requestmessage. The RL parameter update request message includes at least oneof a channel quality indicator (CQI) feedback cycle value, an ACK/NACKrepetition factor value, a CQI repetition factor value, a CQI poweroffset, an ACK power offset and/or NACK power offset value, and anHS-SCCH code change indicator value.

[0056] Preferably, the parameter update information is controlledaccording to radio link configuration information of the currentterminal, and the radio link configuration information is sent from theRNC to the base station.

[0057] Preferably, the parameter updating is performed at everyreporting period or whenever a parameter indicating the state of a radiolink situation exceeds a certain threshold value. The period and thethreshold value are internally set or are sent from the RNC.

[0058] To achieve at least these advantages in whole or in parts, thereis further provided a radio link parameter updating method for a highspeed downlink packet access (HSDPA) system in a mobile communicationsystem, including: a step in which a base station monitors a radiochannel situation of a terminal; a step in which if a radio channelsituation of the terminal changes, the base station initiates parameterupdating; and a step in which the base station sends radio linkparameter update information to the RNC.

[0059] Preferably, the RNC is a serving RNC (SRNC).

[0060] Preferably, the radio link parameter is a high speed dedicatedphysical control channel (HS-DPCCH) related parameter. And the radiolink parameter is a high speed downlink shared channel (HS-DSCH) relatedparameter and a downlink shared control channel (HS-SCCH) relatedparameter.

[0061] Preferably, the parameter update information is a radio link (RL)parameter update request message. The RL parameter update requestmessage includes at least one of a channel quality indicator-(CQI)feedback cycle value, an ACK/NACK repetition factor value, a CQIrepetition factor value, a CQI power offset, an ACK power offset and/orNACK power offset value, and an HS-SCCH code change indicator value, andthe parameter update information is sent through an RL parameter updaterequest message.

[0062] In the method, the parameter updating is performed at everyreporting period or whenever a parameter indicating the state of a radiolink situation exceeds a certain threshold value. The period and thethreshold value are internally set or are sent from the RNC.

[0063] The radio link parameter updating method further includes a stepin which criteria for decision of the parameter updating is sent fromthe RNC to the base station through the RL parameter update initiationmessage.

[0064] In the method, the decision criteria may include a parameterindicating which parameter the base station should measure to detectchange of a radio link; an event type parameter indicating whether toperform parameter updating periodically or on the basis of an event; anda parameter indicating an actual period for the event type parameter ora threshold value.

[0065] The radio link parameter updating method further includes a stepin which when the radio link connected to the terminal changes, the RNCsends new radio link configuration information to the base station.

[0066] Preferably, the base station constructs the parameter updateinformation to be sent to the RNC according to the new radio linkconfiguration information, and the new RL configuration information issent through an RL configuration information message. In this case, thebase station analyzes the RL configuration information of the currentterminal, and triggers the parameter updating when the terminal entersor leaves a handover,situation. In addition, the base station analyzesthe RL configuration information of the current terminal and triggersthe parameter updating when there is a change in the number of radiolinks of the terminal.

[0067] The radio link parameter updating method further includes a stepin which the updated RL parameter and the time information indicatingwhen to apply the parameter are sent from the RNC to the base station.

[0068] Preferably, the time information is activation time or aconnection frame number (CFN) parameter.

[0069] The radio link parameter updating method further includes a stepin which the updated RL parameter and the time information indicatingwhen to apply the parameter are sent from the RNC to the terminal.

[0070] To achieve at least these advantages in whole or in parts, thereis further provided a radio link parameter updating method for a highspeed downlink packet access (HSDPA) system in a mobile communicationsystem, including: a radio link (RL) parameter update procedure in whichif a radio channel of a terminal is changed, parameter updateinformation is sent to a radio network controller (RNC) to triggerupdating of an HSDPA related parameter; and a radio resource control(RRC) procedure in which the HSDPA related parameter is updatedaccording to the received parameter update information and the updatedparameter is signaled from the RNC to the terminal.

[0071] Preferably, the RNC is a serving RNC (SRNC).

[0072] Preferably, the parameter update information is sent through anRL parameter update request message.

[0073] Preferably, the RL parameter update request message includes atleast one of a channel quality indicator (CQI) feedback cycle value, anACK/NACK repetition factor value, a CQI repetition factor value, a CQIpower offset, ACK power offset and/or NACK power offset value, and anHS-SCCH code change indicator value.

[0074] Preferably, the RNC sends the HSDPA related parameter which hasbeen updated through the RL parameter update response message and timeinformation indicating a time point when the parameter is to be actuallyapplied, to the base station. In this case, the time information can beactivation time or a connection frame number (CFN) parameter. Inaddition, the RNC sends the updated HSDPA related parameter and the timeinformation indicating a time point when the parameter is actuallyapplied, to the terminal by using radio bearer reconfiguration,transport channel reconfiguration, or physical channel reconfigurationmessage.

[0075] Preferably, the RL parameter update procedure is performed atevery reporting period or whenever a parameter indicating the state of aradio link situation exceeds a certain threshold value. The period andthe threshold value are internally set or are sent from the RNC.

[0076] The radio link parameter updating method further includes: an RLparameter update initiation procedure in which the RNC sends informationused for update of a HSDPA related parameter to Node B through an RLparameter update initiation request message.

[0077] Preferably, the RL parameter update initiation request messageincludes: a parameter indicating which parameter the base station shouldmeasure to detect change of a radio link; an event type parameterindicating whether to perform parameter updating periodically or on thebasis of an event; and a parameter indicating an actual period for theevent type parameter or a threshold value.

[0078] The radio link parameter updating method further includes: an RLconfiguration information procedure used to signal an RL configurationinformation of the terminal from the RNC to the base station by usingthe RL configuration information message.

[0079] Preferably, the base station performs an RL parameter updateprocedure by acquiring information on whether the terminal is in a softhandover and a change in the number of radio links on the basis of theRL configuration information message.

[0080] Preferably, the base station performs the RL parameter updateprocedure when the terminal enters or leaves a soft handover situation.In addition, the base station performs the RL parameter update procedurewhen the number of radio links for the terminal changes.

[0081] Additional advantages, objects, and features of the inventionwill be set forth in part in the description which follows and in partwill become apparent to those having ordinary skill in the art uponexamination of the following or may be learned from practice of theinvention. The objects and advantages of the invention may be realizedand attained as particularly pointed out in the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

[0082] The invention will be described in detail with reference to thefollowing drawings in which like reference numerals refer to likeelements wherein:

[0083]FIG. 1 illustrates a frame structure of an uplink HS-DPCCH in theHSDPA system;

[0084]FIG. 2 illustrates a structure of a UMTS radio access network(UTRAN) in the HSDPA system;

[0085]FIG. 3 illustrates a control plane protocol of the UTRAN.

[0086]FIG. 4 illustrates a flow chart describing a procedure for settingup of a HS-DSCH channel in the HSDPA system;

[0087]FIG. 5 is a flow chart of a HSDPA parameter updating method inaccordance with the present invention;

[0088]FIGS. 6A and 6B are flow charts of a radio link (RL) parameterupdate procedure, in case that the RL parameter update procedure issuccessful;

[0089]FIGS. 7A and 7B are flow charts of an RL parameter updateprocedure, in case that the RL parameter update procedure is failed;

[0090]FIGS. 8A and 8B are flow charts of an RL parameter updateinitiation procedure, in case that the RL parameter update procedure issuccessful;

[0091]FIGS. 9A and 9B are flow charts of an RL parameter updateinitiation procedure, in case that the RL parameter update procedure isfailed;

[0092]FIGS. 10A and 10B are flow charts showing the case where the radiolink configuration information procedure is actually applied;

[0093]FIG. 11 is a flow chart showing the case where the radio linkparameter update procedure is actually applied;

[0094]FIG. 12 is a signal flow chart showing the case that the RLparameter update initiation procedure and the RL parameter updateprocedure are carried out together;

[0095]FIG. 13 is a signal flow chart showing the case that the RLconfiguration information procedure and the RL parameter updateprocedure are carried out together; and

[0096]FIG. 14 is a signal flow chart showing the case that the RLparameter update initiation procedure, the RL configuration informationprocedure and the RL parameter update procedure are carried outtogether.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0097] The present invention is implemented in such a mobilecommunication system as the UMTS (universal mobile telecommunicationssystem), which has been recently developed by 3GPP. However, withoutbeing limited thereto, the present invention can be also applied to acommunication system operated with different standards. Preferredembodiments of the present invention will now be described.

[0098] Referring to the HSDPA system, an HSDPA scheduler exists in anode B. The HSDPA scheduler of the node B transmits control informationrelated to an HS-PDSCH through a shared control channel (HS-SCCH) to aUE in downlink and a HS-DSCH data through a HS-PDSCH to the UE indownlink. In response, the UE transmits a HSDPA-related feedbackinformation (ACK/NACK, and CQI) to the node B through an HS-DPCCH inuplink. The HSDAP scheduler of Node B can configure a HSDPA relatedparameter (HS-DPCCH related, HS-DSCH related, or HS-SCCH relatedparameter) to control the transmissions in downlink and uplink. Forexplanations' sake, in the present invention, the parameter is confinedto the HS-DPCCH related parameter.

[0099] The node B (HSDPA scheduler) may detect a situation of the radiochannel on the basis of the HS-DPCCH related parameter and requestupdating of the HS-DPCCH related parameter.

[0100] For example, if the radio channel is in good condition, the nodeB reduces the repetition of ACK/NACK and CQI, thereby preventingconsumption of the radio resource. Meanwhile, if the radio channel isnot in a good condition, the node B increases the repetition of ACK/NACKand CQI, thereby improving performance of ACK/NAKC and CQI transmission.The HSDPA scheduler of the node B and the scheduler of the RNC will bereferred to simply as a node B and the RNC hereinafter.

[0101] In order to improve a performance of an HSDPA system, the presentinvention proposes a radio link parameter update procedure initiated bythe node B. The present invention also proposes a signaling for sendinga to-be-updated parameter from the node B to the radio networkcontroller (RNC), basic procedures to support the signaling, and anapplication example using the basic procedures.

[0102]FIG. 5 is a flow chart of an HSDPA parameter updating method inaccordance with the present invention.

[0103] As shown in FIG. 5, when a state (situation) of the radio channelfor the terminal (that is, the UE) which supports an HSDPA service (stepS202) changes, the node B determines whether to update a HSDPA relatedparameter (step S204). If the node B determines updating the HSDPArelated parameter, the node, B calculates the corresponding parameter(step S206) and sends it to the RNC to request updating of thecorresponding parameter (step S208).

[0104] Then, the RNC performs updating according to the parameter valuereceived from the node B, informs the node B that updating has beencompleted (step S210), and sends the updated parameter to the UE throughan RRC signaling to update the parameter of the UE (step S212). Andthen, the updated parameter can be sent to the node B together over theupdate response.

[0105] In the present invention, in order to trigger the updating of theHSDPA related parameter from the node B to the RNC according to the flowchart, the radio link (RL) parameter update procedure initiated by thebase station is defined as follows.

[0106] 1. RL Parameter Update Procedure

[0107]FIGS. 6A and 6B show the case that the RL parameter updateprocedure has been successfully performed, while FIGS. 7A and 7B showthe case that the RL parameter update procedure has been failed.

[0108] If the situation of the radio channel for the UE changes, thenode B determines whether to update the HSDPA related parameter and thenperforms the RL parameter update procedure, a basic procedure, totrigger the to-be-updated information to the node B.

[0109] That is, as shown in FIG. 6A, when the RL parameter updateprocedure is performed, the node B informs the CRNC of the to-be-updatedinformation (step S220). In such a case, the to-be-updated informationis a RL parameter update request message. The RL parameter updaterequest message may contain a CQI feedback cycle parameter (k), anACK/NACK repetition factor (N_acknack_transmit) and a CQI repetitionfactor (N_cqi_transmit), or may contain a CQI power offset, an ACK poweroffset and/or NACK power offset and HS-SCCH code change indicator.

[0110] After the CRNC updates the corresponding parameter by using theparameter value received from the node B, it responds thereto through anRL parameter update response message (step S222), which may contain theupdated parameter and a parameter (that is, a connection frame number(CFN)) indicating a time point when the updated parameter is to beactually applied.

[0111] Accordingly, the HSDPA scheduler of the node B can control theACK/NACK transmission and the CQI reporting which are performed by theUE, through the RL parameter update procedure, the basic procedure.

[0112] As mentioned above, in the RL parameter update procedure, the RNCfinally performs the updating of parameter as requested by the node B.In this respect, however, if the node B and the RNC do not reach anagreement regarding update of a parameter, that is, if the node B needsupdating of a parameter while the RNC does not need updating of thecorresponding parameter, the RNC finally determines whether to updatethe parameter.

[0113] The CRNC and the SRNC may be collocated or may not be collocated.In case that the CRNC is not collocated with the SRNC owing to mobilityof a UE, the CRNC can be connected with the SRNC on lur interface.

[0114] If the CRNC is not collocated with the SRNC, as shown in FIG. 6B,the CRNC sends a parameter value which has been received by the node Bto the SRNC (step S224), and the SRNC commands the node B to adopt theparameter updating through the RL parameter update response message(step S226).

[0115] In addition, the SRNC sends information on the HSDPA relatedparameter which has been received by the node B to the UE through theradio resource control (RRC) signaling. In this case, the RRC signalingmay use a radio bearer reconfiguration, a transport channelreconfiguration, or a physical channel reconfiguration message.

[0116]FIGS. 7A and 7B show a signaling flow in case that the RLparameter update procedure is failed.

[0117] If the RL parameter update procedure is failed, the CRNC or theSRNC informs the node B of the failure of parameter updating through anRL parameter update failure message (steps S230, S232, S234 and S236).

[0118] In the present invention, the following four methods are used todetermine whether or not the node B initiates updating the HSDPA relatedparameter.

[0119] 1) The HSDPA related parameter is updated according to aninternal implementation of the node B. In other words, an update periodor a threshold value is internally set in the node B, so that when it'sthe update period or when the parameter indicating a state of the radiolink exceeds a certain threshold value, parameter updating is performed.In this case, an additional signaling is not necessary on the interfacebetween the node B and the RNC.

[0120] 2) The HSDPA related parameter is updated by signaling betweenthe node B and the RNC.

[0121] 2-1) The HSDPA related parameter is periodically updated

[0122] 2-2) If the parameter indicating the state of the radio linkexceeds the threshold value, the HSDPA related parameter is updated

[0123] 2-3) The HSDPA related parameter is updated according to whetherthe UE is in a soft handover

[0124] The method 2) refers to a case that the RNC sets when the HSDPArelated parameter value is to be received from the node B. The RNC sendsa reporting condition of the HSDPA related parameter value to the node Bthrough signaling. The method 2-1) refers to a periodical updatingmethod while the method 2-2) refers to an event-based updating method.

[0125] Therefore, in order to use the methods (2-1, 2-2), the parameterupdating method (periodical updating/event-based updating) and asignaling for informing a required parameter (period/threshold value)from the SRNC to the node B are required, for which, the presentinvention defines the RL parameter update initiation procedure, thebasic procedure: FIGS. 8A and 8B show the case that the RL parameterupdate initiation procedure has been successfully performed, and FIGS.9A and 9B show the case that the RL parameter update initiationprocedure is failed).

[0126] 2. RL Parameter Update Initiation Procedure

[0127] As shown in FIG. 8A, when the RL parameter update initiationprocedure is initiated, the CRNC sends a RL parameter update initiationrequest message to the node B (step S240), and the node B sends an RLparameter update initiation response message to the CRNC in response(step S242).

[0128] The RL parameter update initiation request message includes aparameter indicating which parameter the node B should measure and anevent type parameter. The event type parameter is an enumeration typeparameter which has two kinds of values of periodic and event. If theevent type parameter value is periodic, parameter updating is performedperiodically according to a provided period. Meanwhile, if the eventtype parameter value is the event, parameter updating is performed whenthe parameter indicating the state of the radio link exceeds a pre-setupper limit threshold value or lower limit threshold value. In addition,if the event type parameter value is periodic, it additionally includesa parameter informing a period, while if the event type parameter valueis the event, it additionally includes a parameter informing a thresholdvalue.

[0129] If the CRNC and the SRNC are not collocated, as shown in FIG. 8B,the SRNC sends the RL parameter update initiation request message to thenode B through the CRNC (step S244), and receives the RL parameterupdate initiation response message in response (step S246).

[0130]FIGS. 9A and 9B are flow charts showing the case that the RLparameter update initiation procedure is failed.

[0131] In response to the RL parameter update initiation requestmessage, the CRNC or the SRNC receives an RL parameter update initiationfailure message from the node B or from the CRNC (steps S250, S252, S254and S256).

[0132] As stated above, the node B can send the information whichtriggers updating the HSDPA related parameter to the RNC according to aperiod or a threshold value set in the node B itself or a period or athreshold value set by the RNC.

[0133] The current 3GPP standard does not allow the node B to detectwhether or not the UE is in a handover situation. Therefore, it isdifficult that the node B performs the parameter updating inconsideration of the condition of the whole radio link for a UE.

[0134] In the method 2-3), the RNC informs the node B of the radio linkconfiguration of the UE so that the node B can more properly perform theRL parameter update procedure. The RNC informs the node B of the radiolink configuration information whenever the radio link configuration ofthe UE changes. On the basis of the information, the node B controls theHSDPA related parameter value to be updated.

[0135] In order to use the method 2-3), a signaling that the SRNCinforms the node B of whether the UE has been in soft handover isrequired. For this purpose, in the present invention, the RLconfiguration information procedure, the basic procedure, is defined asshown in FIGS. 10A and 10B.

[0136] 3. RL Configuration Information Procedure

[0137] With reference to FIG. 10A, in the RL configuration informationprocedure, the CRNC sends an RL configuration information message of theNABP protocol to the node B. If the CRNC and the SRNC are notcollocated, the SRNC sends the RL configuration information message tothe node B through the DRNC as shown in FIG. 10B.

[0138] The RL configuration information message may containconfiguration information of radio links set in a specific UE (i.e., alist of radio links set in the corresponding UE). With this information,the HSDPA scheduler of the node B can recognize whether thecorresponding UE is in a soft handover (SHO) and the number of radiolinks set in the corresponding UE as well.

[0139] The RL configuration information message, a radio link situationreport message, is sent to the node B by the RNC when the configurationof the radio link changes such as when a radio link is added to thecorresponding UE or when an existing radio link is removed.

[0140] The combination of the RL parameter update procedure, the basicprocedure, and the method (2-3) occurs in the following cases:

[0141] 1. the RL parameter update procedure is performed when thecorresponding UE enters or leaves a soft handover

[0142] 2. the RL parameter update procedure is performed when there is achange in the number of radio links of the corresponding UE.

[0143] The methods for determining a parameter updating (1, 2, 2-1, 2-2,2-3) and application example of updating the HSDPA related parameter byusing the RL parameter update procedure will now be described.

[0144]FIG. 11 is a signal flow chart of the RL parameter updateprocedure. That is, FIG. 11 shows an application example of updating theHSDPA related parameter by using the RL parameter update procedure andthe method for determining parameter updating.

[0145] The node B internally measures radio environment or monitorsstatus of user data transmission (e.g. existence or non-existence of adata unit to be transmitted). As shown in FIG. 13, if it's the end of anupdate period or the parameter indicating the state of the radio linkexceeds a certain threshold value, the node B initiates updating of theHS-DPCCH related parameter (step S270). The node B sends theto-be-updated HSDPA related parameter value to the RNC through the RLparameter update request message of the NBAP, to initiate the RLparameter update procedure (step S272).

[0146] If there is the DRNC due to mobility of a UE, the DRNC sends theto-be-updated HSDPA related parameter value received from the node B, tothe SRNC through the RL parameter update request message of the RNSAP(step S274).

[0147] Then, the SRNC sends the updated HSDPA related parameter andactivation time, that is, time information as to when the HSDPA relatedparameter value is to be applied, to the node B through the RL parameterupdate response message (step S276). The activation time contains aconnection frame number (CFN) value indicating when the new HSDPArelated parameter is applied.

[0148] If the DRNC exists, the DRNC sends the activation time receivedfrom the SRNC to the node B through the RL parameter update responsemessage of the NBAP (step S278).

[0149] The RNC sends the updated HSDPA related parameter to the UEthrough the RRC signaling, that is, by using a RRC message such as theradio bearer reconfiguration, transport channel reconfiguration andphysical channel reconfiguration message. At this time, the activationtime, that is, time information as to when the updated parameter valueis to be applied, is also sent over the RRC message. The activation timesent to the UE is the same as the activation time sent to the node B.The RRC message is sent through the logical channel (DCCH).

[0150] The UE receives the new HSDPA related parameter from the RNCthrough the radio bearer reconfiguration, the transport channelreconfiguration, or the physical channel reconfiguration message,updates a stored HSDPA related parameter with the new HSDPA relatedparameter, and responds thereto with a complete message (step S282). Thenew HSDPA related parameter value is applied to the corresponding UE atthe time point the activation time indicates.

[0151]FIG. 12 is a signal flow chart showing an example that the RLparameter update initiation procedure and the RL parameter updateprocedure are performed together. That is, FIG. 12 shows an example thatthe HSDPA related parameter is updated by combination of the RLparameter update procedure, the basic procedure, and the method fordetermining parameter updating (2-1 or 2-2).

[0152] The RNC sends the RL parameter update initiation request messageto the node B to inform as to whether parameter updating is to beperiodically performed or to be performed on the basis of an event (stepS290). If the DRNC exists, the SRNC sends the RL parameter updateinitiation request message to the node B through the DRNC (step S292).In response, the node B sends the RL parameter update initiationresponse message to the RNC. If the DRNC exists, the node B sends the RLparameter update initiation response message to the SRNC through theDRNC (steps S294 and S296).

[0153] Then, the node B determines whether to update the HS-DPCCHrelated parameter on the basis of the parameter updating methodcontained in the RL parameter update initiation request message(periodical updating/event-based updating) and its associated parameter(period/threshold value) (step S298).

[0154] In other words, if the value contained in the RL parameter updateinitiation request message satisfies a certain condition (that is, ifit's the end of a period or if the parameter indicating the state of theradio link exceeds an upper limit or a lower limit of a thresholdvalue), the node B decides to update (reconfigures) the HSDPA relatedparameter. And then, the node B sends the to-be-updated HSDPA relatedparameter to the RNC through the RL parameter update request message ofthe NBAP. The following operations are the same as those in FIG. 11except that the step numbers are different, of which descriptions arethus omitted.

[0155]FIG. 13 is a signal flow chart showing an example that the RLconfiguration information procedure and the RL parameter updateprocedure are performed together. That is, FIG. 13 shows an example thatthe HSDPA related parameter is updated by the combination of the RLparameter update procedure, the basic procedure, and the method fordetermining parameter updating (2-3).

[0156] If there is a configuration change in the radio link (RL)connected to the corresponding UE, the RNC sends the configurationinformation message containing the information of the new radio link tothe node B, in order to initiate the RL configuration informationprocedure (step S310).

[0157] If the DRNC exists, the SRNC first sends the RL configurationinformation message to the DRNC (step S312). Then, the DRNC sends thereceived radio link configuration information to the corresponding nodeB through the RL configuration information message of the NBAP (stepS314).

[0158] Upon recognizing the change of radio link configuration from theSRNC, the node B performs the RL parameter update procedure and requeststhe RNC to reconfigure the existing HSDPA related parameter with the;new HSDPA related parameter value for the new radio link configuration.If the DRNC exists, the node B first sends the new HSDPA relatedparameter value to the DRNC through the RL parameter update requestmessage (step S316). The following procedure is the same as that of FIG.11, only except that the step numbers are different.

[0159]FIG. 14 is a signal flow chart showing an example that the RLparameter update initiation procedure, the RL configuration informationprocedure and the RL parameter update procedure are performed together.That is, FIG. 14 shows an example that the node B determines whether toupdate the HS-DPCCH related parameter by using the method (2-1 or 2-2)and it calculates more exact parameter value by adopting the method(2-3).

[0160] With reference to FIG. 14, the RNC sends the RL parameter updateinitiation request message to the node B in order to inform whether aparameter updating report is to be periodically performed or performedon the basis of an event. If the DRNC exists, the SRNC first sends theRL parameter update initiation request message to the DRNC (step S340),and then the DRNC sends the RL parameter update initiation requestmessage received from the SRNC to the corresponding node B (step S342).

[0161] In response, the node B sends a RL parameter update initiationresponse message to the RNC. If there exists the DRNC, the DRNC sendsthe RL parameter update initiation response message received from thenode B, to the SRNC (steps S344 and S348).

[0162] If there is a configuration change in the radio link connected tothe corresponding UE, the RNC informs the node B of the new radio linkconfiguration information through the RL configuration informationmessage. If the DRNC exists, the SRNC first sends the RL configurationinformation message to the DRNC (step S350), and then, the DRNC informsthe node B of the radio link configuration information through the RLconfiguration information message of the NBAP (step S352).

[0163] Upon recognizing the configuration change in the radio link fromthe SRNC, the node B determines updating of the HSDPA related parameterif the corresponding condition is satisfied (that is, if it exceeds theupper limit or the lower limit of the period/threshold value) (stepS354). At this time, the node B determines more proper HS-DPCCH relatedparameter value in consideration of the configuration change informationin the radio link received from the SRNC through the RL configurationinformation message. If the DRNC exists, the node B first sends the newHS-DPCCH related parameter value to the DRNC through the RL parameterupdate request message (step S356), and the following procedure is thesame as that of FIG. 11 only except that the step numbers are different.

[0164] As so far described, the radio link parameter updating method ina mobile communication of the present invention has the followingadvantages.

[0165] That is, the base station (the node B) initiates updating of theHS-DPCCH related parameter by itself and sends the to-be-updatedparameter value to the RNC, so that the HS-DPCCH related parameter canbe finally updated in the RNC.

[0166] Thus, compared to the conventional art in which the HS-DPCCHrelated parameter, that is, the CQI feedback cycle (k) value, can beupdated only through the radio link setup and the radio linkreconfiguration procedure initiated by the RNC, in the presentinvention, the HS-DPCCH related parameter is updated through the radiolink parameter update procedure initiated by the base station, so thatthe HS-DPCCH related parameter can be updated at the optimum moment Withthe proposed procedure that the base station signals the to-be-updatedparameter to the RNC, the base station applies the optimum parametervalue reflecting the situation of the radio link.

[0167] In addition, when the base station (node B) initiates theparameter update procedure, the RNC provides a procedure providinginformation required for determining the parameter updating, so thatother parameters than the k value can be also updated suitable to thesituation of the base station.

[0168] Moreover, by defining the procedure that the RNC informs the basestation of the soft handover or a change in the situation of the radiolink, the base station can perform the parameter updating inconsideration of every situation of the radio link. That is, in the casethat the configuration of the radio link changes, for example, when aradio link is newly added to the terminal or when the existing radiolink is removed therefrom, the base station is able to set a parametersuitable to the situation.

[0169] Consequently, we can effectively prevent a waste of power orresource cased by setting of improper parameters by appropriatelyapplying the proposed procedures depending on the condition of radiolinks for a terminal.

[0170] The foregoing embodiments and advantages are merely exemplary andare not to be construed as limiting the present invention. The presentteaching can be readily applied to other types of apparatuses. Thedescription of the present invention is intended to be illustrative, andnot to limit the scope of the claims. Many alternatives, modifications,and variations will be apparent to those skilled in the art. In theclaims, means-plus-function clauses are intended to cover the structuredescribed herein as performing the recited function and not onlystructural equivalents but also equivalent structures.

What is claimed is:
 1. A radio link parameter updating method for asystem having a control center and a plurality of radio link connectionnodes, comprising: deciding a radio link updating at a radio linkconnection node; and triggering updating of a radio link parameter fromthe radio link connection node to the control center.
 2. The method ofclaim 1, wherein the control center is a radio network control (RNC). 3.The method of claim 1, wherein the radio link connection node is a nodeB.
 4. The method of claim 1, wherein the radio link parameter is a highspeed downlink packet access (HSDPA) related parameter.
 5. The method ofclaim 1, wherein the radio link connection node triggers the parameterupdating by sending parameter information to the control center.
 6. Themethod of claim 5, wherein the parameter information includes at leastone of a channel quality indicator (CQI) feedback cycle, an ACK/NACKrepetition factor and a CQI repetition factor.
 7. The method of claim 6,wherein the parameter information further includes a CQI power offset,an ACK power offset and/or NACK power offset, and HS-SCCH code changeindicator.
 8. The method of claim 1, wherein the radio link connectionnode triggers parameter updating to the control center when a radiochannel state of a terminal is changed.
 9. The method of claim 1,wherein the radio link connection node triggers parameter updating atevery regular periods or when a parameter indicative of a state of aradio link exceeds a certain threshold value.
 10. The method of claim 9,wherein the period and the threshold value are internally set.
 11. Themethod of claim 9, wherein the period and the threshold value areprovided from the control center.
 12. The method of claim 5, wherein theradio link connection node controls to-be-updated parameter informationaccording to a radio link configuration information of the terminal. 13.The method of claim 12, wherein the radio link configuration informationis sent from the control center.
 14. The method of claim 12, wherein theradio link connection node analyzes the radio link configurationinformation and triggers parameter updating to the control center onlywhen the terminal initiates and terminates a handover.
 15. The method ofclaim 12, wherein the radio link connection node triggers parameterupdating to the control center only when the number of radio links ofthe terminal changes.
 16. The method of claim 1, wherein the radio linkconnection node has a hybrid automatic repeat request (HARQ) function.17. The method of claim 1 further comprising: transmitting the parameterupdated at the control center and time information to the terminal. 18.The method of claim 17, wherein the time information is activation timeor a connection frame number (CFN) parameter.
 19. The method of claim 1,wherein the control center is a serving RNC.
 20. A radio link parameterupdating method for a system having a control center and a plurality ofradio link connection nodes, comprising: detecting a state of a radiolink at a radio link connection node; sending a information for radiolink updating from the radio link connection node to a control center ifthe state of the radio link has changed; and updating a radio linkparameter at the control center based on the information.
 21. The methodof claim 20, wherein the control center is a radio network controller(RNC).
 22. The method of claim 21, wherein the RNC is a serving RNC. 23.The method of claim 20, wherein the radio link connection node is a nodeB.
 24. The method of claim,20i,,wherein the information is a high speeddownlink packet access (HSDPA) related parameter value.
 25. The methodof claim 20, wherein the information is delivered through a radio linkparameter update request message.
 26. The method of claim 25, whereinthe RL parameter update request message includes at least one of achannel quality indicator (CQI) feedback cycle, an ACK/NACK repetitionfactor, a CQI repetition factor, a CQI power offset, an ACK power offsetand/or NACK power offset, and an HS-SCCH code change indicator.
 27. Themethod of claim 20, wherein the information is delivered at everyregular periods or when a parameter indicative of a state of a radiolink exceeds a certain threshold value.
 28. The method of claim 27,wherein the period and the threshold value are pre-set values of theradio link connection node.
 29. The method of claim 20 furthercomprising: delivering a criteria for decision of the parameter updatingfrom the control center to the radio link connection node.
 30. Themethod of claim 29, wherein the decision criteria comprises a parameterindicative of what parameter is to be measured to detect a change of theradio link; an event type parameter indicative of whether to performparameter updating periodically or on the basis of an event; and aparameter indicative of an actual period for the event type parameter ora threshold value.
 31. The method of claim 20 further comprising:sending new radio link configuration information from the control centerto the radio link connection node if the radio link is changed.
 32. Themethod of claim 20, wherein the radio link connection node controlsradio link update information to be delivered to the control centeraccording to the radio link configuration information.
 33. The method ofclaim 32, wherein the radio link connection node analyzes the radio linkconfiguration information and delivers the radio link update informationto the control center only when the terminal initiates and terminates ahandover.
 34. The method of claim 32, wherein the radio link connectionnode analyzes the radio link configuration information of the terminaland delivers the radio link update information to the control centeronly when there is a change in the number of radio links.
 35. The methodof claim 20 further comprising: transmitting the updated parameter andtime information from the control center to the terminal.
 36. The methodof claim 35, wherein the time information is activation time or aconnection frame number (CFN) parameter.
 37. A radio link parameterupdating method for a high speed downlink packet access (HSDPA) system,comprising: receiving a criteria for decision of the parameter updatingfrom a radio network controller (RNC); delivering a information forradio link updating from a base station to the RNC if the decisioncriteria is satisfied; and updating a radio link parameter in the RNCbased on the received radio link update information.
 38. The method ofclaim 37, wherein the RNC is a serving RNC.
 39. The method of claim 37,wherein the radio link parameter is a high speed dedicated physicalcontrol channel (HS-DPCCH) related parameter.
 40. The method of claim37, wherein the radio link update information is delivered through aradio link (RL) parameter update request message which includes at leastone of a channel quality indicator (CQI) feedback cycle, an ACK/NACKrepetition factor, a CQI repetition factor, a CQI power offset, an ACKpower offset and/or NACK power offset, and an HS-SCCH code changeindicator 41
 41. The method of claim 37, wherein the decision criteriais a period or a threshold value, and the base station delivers theinformation at every regular periods or when a parameter indicative of astate of the radio link exceeds a certain threshold value.
 42. Themethod of claim 37 further comprising: transmitting the updated radiolink parameter to the terminal.
 43. The method of claim 37 furthercomprising: delivering new radio link configuration information from theRNC to the base station through an RL configuration information messageif the radio link changes.
 44. The method of claim 43, wherein the basestation controls the radio link update information to be delivered tothe RNC according to the new radio link configuration information.
 45. Aradio link parameter updating method for a high speed downlink packetaccess (HSDPA) system, comprising: detecting a radio channel state;receiving a parameter update criteria and a radio link configurationinformation from a radio network controller (RNC); sending a radio linkupdate information to the RNC according to a radio channel state and theradio link configuration information if the parameter update criteria issatisfied; and updating a radio link parameter in the RNC according tothe radio link update information.
 46. The method of claim 45, whereinthe RNC is a serving RNC.
 47. The method of claim 45, wherein the radiolink parameter is a high speed dedicated physical control channel(HS-DPCCH) related parameter.
 48. The method of claim 45, wherein theradio link update information is delivered through a radio link (RL)parameter update request message which includes at least one of achannel quality indicator (CQI) feedback cycle, an ACK/NACK repetitionfactor, a CQI repetition factor, a CQI power offset, an ACK power offsetand/or NACK power offset, and an HS-SCCH code change indicator.
 49. Themethod of claim 45, wherein the radio link update criteria is a periodor a threshold value, and the base station sends the radio link updateinformation to the RNC at every regular periods or when a parameterindicative of a state of the radio link exceeds a certain thresholdvalue.
 50. The method of claim 45, wherein the base station transmitsthe radio link update information to the RNC only when the terminalstarts and sends a soft handover by using the radio link configurationinformation.
 51. The method of claim 45, wherein the base station sendsthe radio link update information to the RNC only when there is a changein the number of the radio links of the terminal by using the radioconfiguration information.
 52. The method of claim 45 furthercomprising: transmitting the updated parameter and time information fromthe RNC both to the base station and to the terminal.
 53. A radio link(RL) parameter updating method in a high speed downlink packet access(HSDPA) system, comprising: an RL parameter update procedure whichtriggers updating of an RL parameter by sending a update informationfrom a base station to a radio network controller (RNC); and a radioresource control (RRC) procedure which transmits the RL parameterupdated in the RNC according to the received update information to aterminal.
 54. The method of claim 53, wherein the RNC is a serving RNC.55. The method of claim 53, wherein the update information is sentthrough an RL parameter update request message.
 56. The method of claim53, wherein the RL parameter update request message includes at leastone of a channel quality indicator (CQI) feedback cycle value, anACK/NACK repetition factor value, a CQI repetition factor value, a CQIpower offset, an ACK power offset and/or NACK power offset value, and anHS-SCCH code change indicator value.
 57. The method of claim 53, whereinthe RNC sends the updated parameter time information to the base stationthrough an RL parameter update response message.
 58. The method of claim57, wherein the time information is activation time or a connectionframe number (CFN) parameter.
 59. The method of claim 53, wherein theRNC sends the updated parameter and the time information to the terminalby using one of radio bearer reconfiguration, a transport channelreconfiguration and a physical channel reconfiguration message.
 60. Themethod of claim 53, wherein the RL parameter update procedure isperformed at every regular periods or when a parameter indicative of astate of the radio link exceeds a certain threshold value.
 61. Themethod of claim 60, wherein the period and the threshold value arepre-set values in the base station.
 62. The method of claim 60, whereinthe period and the threshold value are provided from the RNC.
 63. Themethod of claim 53 further comprising: an RL parameter update initiationprocedure which informs a radio link update ctiteria through an RLparameter update initiation request message from the RNC to the basestation.
 64. The method of claim 63, wherein the RL parameter updateinitiation request message comprises: a parameter indicative of whatparameter is to be measured to detect a change of the radio link; anevent type parameter indicative of whether to perform parameter updatingperiodically or on the basis of an event; and a parameter indicative ofan actual period of the event type parameter or a threshold value. 65.The method of claim 53 further comprising: an RL configurationinformation procedure which delivers a radio link configurationinformation of the terminal through an RL configuration informationmessage from the RNC to the base station.
 66. The method of claim 65,wherein the RL parameter update procedure is performed by determiningwhether the terminal is in a soft handover and a change in the number ofradio links on the basis of the RL configuration information message.67. The method of claim 66, wherein the RL parameter update procedure isperformed only when the terminal starts or; terminates the softhandover.
 68. The method of claim 66, wherein the RL parameter updateprocedure is performed only when there is a change in the number ofradio links of the terminal.
 69. A method comprising: determining atleast one configuration parameter at an antenna station; andcommunicating said at least one configuration parameter from the antennastation to a controller, wherein the controller is configured to controlthe antenna station.
 70. The method of claim 69, wherein theconfiguration parameter is for configuring communication between amobile station and the antenna station.
 71. The method of claim 69,wherein said determining is comprised in at least one of initiating andupdating said at least one configuration parameter at at least one ofthe antenna station and a mobile station.
 72. The method of claim 69,wherein the controller is configured to control the antenna station toupdate said at least one configuration parameter.
 73. The method ofclaim 69, wherein said at least one configuration parameter is a highspeed downlink packet access related parameter.
 74. The method of claim73, wherein said high speed downlink packet access related parameter isa HSDPA related parameter.
 75. The method/of claim 69, wherein theantenna station is a base station.
 76. The method 75, wherein the basestation is a Node B base station.
 77. The method of claim 69, whereinthe controller is a radio network controller.
 78. The method of claim77, wherein the radio network controller comprises a control radionetwork controller.
 79. The method of claim 77, wherein the radionetwork controller comprises a serving radio network controller.
 80. Themethod of claim 77, wherein the radio network controller comprises adrift radio network controller.
 81. The method of claim 69, wherein saidat least one configuration parameter comprises a channel qualityindicator feedback cycle value.
 82. The method of claim 69, wherein saidat least one configuration parameter comprises an ACK/NACK repetitionfactor value.
 83. The method of claim 69, wherein said at least oneconfiguration parameter comprises a channel quality indicator repetitionfactor value.
 84. The method of claim 69, wherein said at least oneconfiguration parameter comprises a channel quality indicator poweroffset.
 85. The method of claim 69, wherein said at least oneconfiguration parameter comprises an ACK power offset.
 86. The method ofclaim 69, wherein said at least one configuration parameter comprises aNACK power offset value.
 87. The method of claim 70, wherein said atleast one configuration parameter comprises a HS-SCCH code changeindicator value.
 88. The method of claim 69, comprising: from thecontroller, controlling a mobile station to be configured according tothe at least one configuration parameter; and from the controller,controlling the antenna station, to be configured according to the atleast one configuration parameter.
 89. The method of claim 88, whereinthe mobile station is user equipment.
 90. The method of claim 89,wherein user equipment is UE.
 91. The method of claim 88, wherein saidat least one configuration parameter relates to a high speed physicaldownlink shared channel.
 92. The method of claim 91, wherein the highspeed physical downlink shared channel is a HS-DSCH.
 93. The method ofclaim 69, comprising communicating quality information from a mobilestation to the antenna station prior to said determining the at leastone configuration parameter at the antenna station.
 94. The method ofclaim 69, comprising generating quality information, wherein the qualityinformation is a representation of quality of a communication linkbetween a mobile station and the antenna station.
 95. The method ofclaim 94, wherein the quality information is generated at the mobilestation.
 96. The method of claim 94, wherein the quality information isgenerated at the antenna station.
 97. The method of claim 94, whereinsaid quality information comprises radio link information.
 98. Themethod of claim 94, wherein said determining the at least oneconfiguration parameter at the antenna station comprises: analyzing thequality information; determining whether to reconfigure the radio linkbetween the mobile station and the antenna station according to resultsof the analyzing the quality information; and constructing the at leastone configuration parameter according to the results of the analyzingthe quality information, if it is determine to reconfigure the radiolink between the mobile station and the antenna station in saiddetermining whether to reconfigure the radio link.
 99. The method ofclaim 98, wherein the quality information comprises a channel qualityindicator.
 100. The method of claim 99, wherein the channel qualityindicator comprises information determined according to measurement.101. The method of claim 100, wherein the channel quality indicator isdetermined according to measurement of a link between the mobile stationand the antenna station.
 102. The method of claim 101, wherein the linkbetween the mobile station and the antenna station is a L1 link. 103.The method of claim ;101, wherein the measurement of a link between themobile station and the antenna station is a measurement of up link radiointerference.
 104. The method of claim 98, wherein the qualityinformation comprises an acknowledge indicator.
 105. The method of claim104, wherein the acknowledge indicator is ACK.
 106. The method of claim98, wherein the quality information comprises a negative acknowledgeindicator.
 107. The method of claim 106, wherein the negativeacknowledge indicator is NACK.
 108. The method of claim 69, wherein theantenna station and the controller are comprised in a third generationpartnership project universal mobile telecommunications system radioaccess network.
 109. The method of claim 108, wherein said thirdgeneration partnership project universal mobile telecommunicationssystem radio access network is UTRAN.
 110. The method of claim 69,wherein said determining and said communicating are triggered by acondition at the antenna station being satisfied.
 111. The method ofclaim 69, wherein said determining and said communicating are triggeredby the controller requesting the antenna station to perform saiddetermining and said communicating.
 112. An apparatus configuredaccording to said at least one configuration parameter of claim
 1. 113.The apparatus of claim 112, wherein the apparatus is a mobile station.114. The apparatus of claim 113, wherein the mobile station is userequipment.
 115. The apparatus of claim 114, wherein said user equipmentis UE.
 116. The apparatus of claim 112, wherein the apparatus receivessaid at least one configuration parameter from the antenna station. 117.A method, wherein Node B initiates a Radio Link Parameter Update bysending a Radio Link Parameter Update Indication message to a CRNC. 118.The method of claim 117, wherein the message contains at least onesuggested value of at least one HS-DSCH related parameter that should bereconfigured on a radio link.
 119. The method of claim 118, wherein ifNode B needs to update the at least one HS-DSCH related parameter, NodeB shall initiate the Radio Link Parameter Update Indication messageincluding at least one of: FDD—HS-DSCH FDD Update Information IE; andTDD—HS-DSCH TDD Update Information IE.
 120. The method of claim 117,wherein if Node B needs to allocate new HS-SCCH Codes, Node B shallinitiate the Radio Link Parameter Update Indication message includingHS-SCCH Code Change Indicator IE.
 121. The method of claim 117, whereinif Node B needs to update at least one of: a CQI Feedback Cycle k; CQIRepetition Factor; ACK-NACK Repetition Factor; CQI Power Offset; ACKPower Offset; and NACK Power Offset, Node B shall initiate the RadioLink Parameter Update Indication message including at least one of: aCQI Feedback Cycle k IE; CQI Repetition Factor IE; ACK-NACK RepetitionFactor IE; CQI Power Offset IE; ACK Power Offset IE; and NACK PowerOffset IE.